package com.cskaoyan.utils;

import java.util.Random;

/**
 * @author wjj
 * @date 2022-12-29 20:40
 * @describe 输入一个int数值,返回一个int长度的随机字符串,主要用于生成优惠券兑换码,奖品兑换码
 */

public class RandomStrUtils {
    public static String getRandomNickname(int length) {
        String val = "";
        Random random = new Random();
        for (int i = 0; i < length; i++) {
            // 输出字母还是数字
            String charOrNum = random.nextInt(2) % 2 == 0 ? "char" : "num";
            // 字符串
            if ("char".equalsIgnoreCase(charOrNum)) {
                // 取得大写字母还是小写字母
                int choice = random.nextInt(2) % 2 == 0 ? 65 : 97;
                val += (char) (choice + random.nextInt(26));
            } else if ("num".equalsIgnoreCase(charOrNum)) { // 数字
                val += String.valueOf(random.nextInt(10));
            }
        }
        return val;
    }
}
